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(No Model.)V

E. A. SPBRRY. ELECTRIC DEILLINC MACHINE.

N4 PETERS. Pmfumugmphmwnhingxm u. c.

UNITED STATES PATENT OFFICE.,

ELMER A. SPERRY, OE CHICAGO, ILLINOIS, ASSIGNOR TO THE SPERRY ELECTRICMINING MACHINE COMPANY, OF SAME PLACE.

ELECTRIC DRlLLlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 405,187, dated June 11,1.889.

Application led April l, 1889. Serial No. 305,584. (No model.)

To all whom t may concern,.- v

Be it known that I, ELMER A. SPERRY, a

I citizen of the United States, residing at Chiconvenient means fordrilling, and particularly for electrical drills or machines fordrilling minerals and the like. This object I accomplish by means of themechanism illustrated in the accompanying drawings, where- Figure l is across-section through the body of the device. Eig. 2 is a rear view of aportion thereof with parts removed. Fig. 3 is a detail of thedrill-rotating slot; and Fig. 4- is a cross-section on the line Z Z,showing the drill-rotating mechanism.

Like parts are indicated by the saine letters in all the figures.

K is the field-magnet; K, the armature; K2, a controlling balance-wheelon the shaft thereof g K3, the brushes; K, arms on the frame to whichthe armature-shaft is journaled above; K5, the rear cross-piece of theframe, through which the shaft K6 of the armature passes for a guide.

K7 is the base of the frame which supports the drill-driving mechanism,and in this frame is placed a foot-block KS, upon which rests the lowerend of the shaft K6. The shaft KG carries two pinions L L2, whichrespectively mesh with the gears L3 and L4. These gears are journaled,respectively, in the upper portion of the frame L5 and the lower portionK7 and are connected with the crank-plates M M in any desired andpractical way, though preferably by a clutch mechanism such as thatillustrated elsewhere in another case of even date herewith,-Serial No.305,585.

M is a crank-pin having the collar M2 thereabout and encircled by thestraps M3, which are connected by the cross-bar M4, secured in place bythe key M5 and passing through the slot M6 in the piece M7, which liesbetween the two sides of the straps M3.

N is a transverse pin in the pitman-head N', and it is encircled by acollar N2, and this collar by a strap N3, the ends of which are securedto the piece M7 by the transverse pin N4, all of which is more fullyillustrated elsewhere in another application of even date herewith,Serial No. 305,585.

O is the forward part of the frame, cylindrical in cross-section andhaving the projecting' cup-shaped end O, in which is secured and fromwhich projects the cylinder In this cylinder is a reciprocating tube O4,having at its outer extremity the flange O5 and surrounded by a spring0"', which bears at one end against the inner end of the cupshapedportion O and at its other end against the flange O5.

O17 is the drill-rod, flanged and enlarged at O7 and provided with theclamp O8, to which is secured the drill-point O9. On the inner end ofthis drill-rod O17, and rigid therewith, is the ratchet-wheel O10, heldAin position by the spring-dog O11, pivoted on the pitmanhead N Thispitman-head is slotted at O12. Concentric with the ratchet-wheel is thearm O13, having the spring-dog O14, which engages such ratchet-wheel,and the projecting end O15, which passes into the slot O1G in theinterior of the surface O.

All of the parts so far described are 4supported on the frame, which isprovided with the side ledges P P, whereby the entire frame and all ofthe parts so far described are supported on the ribs P P,which aresupported on the side parts P2 P2 of the main supporting-frame. Thesesaid parts come together below inf the supporting portion P3, throughwhich passes the shaft P4, on which the entire machine is supported inany desired position and upon any suitable carriage. The cylinder O isslotted at R, and the head N has a lip R projecting through such slot.Projecting from the framepieces P2 P2 are the rods R2 R2, provided attheir outer extremities with the cross-bar R3, in which is journaled thescrew-rod R4, having the crank R5 at its outer end. This crank can belocked to prevent its rotation by the link R6. This screw-rod R4 passesthrough the lugs R7 RT, secured to the bottom of the IOO frame-plate K7,and between these lugs and screw-threaded on such rod is the screwthreaded ratchet-wheel RS.

R9 is a pivoted bellcrank lever, having at one end the pawl R11J toengage such ratchetwheel, and at the other the rod R11, with thecoupling R12 and the end piece R1i".

R11 is a standard on the frame, and R15 is a spiral spring from suchstandard to the end R3 of the rod.

R16 is a latch on the lug R1, adapted to engage the end R1T of the pawlR1, and thus lock it slightly beyond Ithe limit of its normal motion.

S S are the conductors which supply the current to the motor.

S2 is a switch, and S a cord leading from the handle thereof.

S1 is a pulley, over which such cord passes, and S5 is a lug on thecross-bar R, to which the cord Si is connected.

S is the screwpillar, on which the shaft P1 is secured, and bywhieh theentire machine is supported.

R18 is a lock-pin for the nut R8.

The use and operation of my invention are as follows: rihe operation ofthe motor and the elastically-connected pitman and the d rivingmechanism therefor has been sufficiently described elsewhere in anotherapplication of even date herewith, Serial No. 305,535, and is notspecially claimed here. The operation of the motor rotates its shaft l,and hence Arotates the gears LfE and L1, and thus moves the crank-pin M.This retracts the pitman, which is elastically extensible, and which isconnected at one end with the crankpin lll', and at the other with thepitman-head pin N. ln this device the pitman-head is cylindrical andreciprocates. As the machine is operated the pitman is retracted,carrying with it the pitman-head and all the connected parts andcompressing the spring O, W'hen, by the operation of the release andclutch mechanism which connects the gears L3 and L* with the crankplatesM M, the drill and pit-man-head are released, the spring OU expands andforces the drill forward. As this action takes place, the end O15 of thearm O13, projecting` into the slot O1, causes such arm to be carriedabout its center as it moves longitudinally along the cylinder O, andits spring dog O11, engaging the ratchet wheel O111 rigid on the drillrod O11, causes the same to rotate, and thus the drill to be partlyrotated before its next stroke is given. The head N reciproeates butdoes not rotate within the cylinder O. The cylinder O is fixed, and thedrill-rod O11, with its drill at one end and its ratchet-wheel O11) atthe other, rotates as the work progresses. As suming that the latch R1Gengages the end R1T of the dog R111, so as to throw the rod R11 in itsextreme forward position,wliere the end R13 will never be engaged by thelip R in the stroke, the screw-rod free to be operated by the crank Rf',and when so operated, such screw-red being fixed in its relation to theframe-pieces P2 l, by reason of its being j ournaled so as not toreciprocate in the cross-bar R, whichA is supported by the rods R2 R2,will cause the entire upper portion of the frame which is supported onthe ribs PP to reciprecate or move forward to the work when desired, thenut R8 being during this operation locked by the pin R111. Vhen it isnot desired that this should be done by hand, as in the case of severalmachines being operated by a single workman, the crank is locked by alink RG, so as not to be capable of revolving. In this case it isapparent that the rotation of the ratchet-wheel or nut RS between thelugs RT R`7 will cause the upper frame carrying the operating' mechanismto move forward along the ribs P P. New, in order that this feed may beautomatically accomplished bythe machine and that the feed maybeproportional to the work, l employ the autoinatic feed mechanismconsisting` of the dog R111, elbow-crank lever R1, rod R11, havingtheend R, which projects into the path of the lip R, and theretracting-spring R15. These parts are shown in the position at the endof the stroke, the crank locked and the rod having just been engaged soas to bring the operating mechanism forward. As soon now as the head Nretreats the spiral spring R15 will retract the rod R11 and end R13 andturn the elbow-crank lever on its pivot and brin the dog R1" intoengagement with a lower tooth of the ratchet-wheel RS. l5 y theexpansion of the spring and the operation of the machine the pitman-headN rushes forward, the lip R will engage the end R13, force it and therod R11 forward, raise the dog R111, and cause the ratchet wheel or nutRs to move on the serewrod against thelug R7, and will thus move theoperative parts forward to the work. lf the blow is delivered to thework before the lip R has engaged the projection R3, the meehanism willnot feed until the drill by its operation has proceeded far enough intothe work to cause the lip and projection to engage, when it will againfeed, and hence the feeding is not only automatic, but nicelyproportioned to the progress of the drill. Then the operative parts havereached the limit of their forward motion, further progress on theirpart will draw upon the cord (Y, open the switch, and stop the machine.

lf the velocities of the drill are traced from one dead-center to theother of the crank, it will be noticed that the velocity up to thccenter is gradually increasing, whereas from the middle of the stroke tothe other deadcenter itis gradually decreasing, which, taken inconnection with the ratio and momentum of the interior rotating drill,will develop the additional fact that their friction is least in thecenter of the stroke, at which time therotation should take place. Theslot O1 has its curvature in the center and is straight at its IOO IIO

extremities. The cylindrical portion O, in which reciprocates thecross-head M', serves as an air-cushion for such cross-head.

The hand-feed may be used in conjunction with the automatic feed toincrease the rapidity of operation of the machine, and both may be usedtogether. The cam-groove OIG and arm O13, together with the pawls andratchet connected with the drill-rod, co-operate together to rotate thedrill, and hence are collectively called the rotaton The feature of thisrotator is its faculty of operating only in the middle of thc retractionof the drill, that being the portion of the drills excursion at whichthe friction of the parts is least. Of course other forms of rotators toaccomplish the same result might easily be devised, and hence I do notWish to limit myself to the particular form of rotator used; but I usethe term broadly.

The controlling-switch may obviously be of any desired kind, circuitconnection, or location, the essential feature being that it shall becontrolled in its application so as to affect the motor responsively tothe variations in the relative positions of the fixed and movable framesincident to the excursion of the latter.

I claimi. In a drilling-machine, the combination of a reciprocatingdrill with a rotator operating upon said drill in the middle of itsretraction only.

2. In a drilling-machine, the combination of a reciprocating drill and adriving-crank therefor, and a rotator for such drill operating only inthe middle of the retraction of such drill.

3. In a mining-machine, the combination of a reciprocating drill,driving-crank therefor, and a rotator containing a pin and a cam, thelatter so shaped as only to operate upon the drill in the middle of itsretraction.

4. In a drilling-machine, the combination of a drill-rod with aninclosing-sleeve, a driving-spring about the same, and a guide-cylinderinclosing the Whole with suitable endbearing surfaces for said spring',so that the driving-spring is inclosed and supported internally andexternally.

5. In a drilling-machine, the combination of a fixed frame with a framemovable thereon, a drill, an electric motor therefor supported on saidmovable frame, a switch to control such motor, said switch connectedwith such frames so as to affect the operation of the motor at anypredetermined point in the excursion of the moving frame.

G. In a drilling-machine, the combination of a fixed frame with a framemovable thereon, a drill, an electric motor therefor on said movableframe, and a switch to control such motor, said switch secured on oneframe and its handle connected With the other frame, so that it isoperated to affect the motor responsive to the variations in therelative positions of the two frames.

7. In a diillingmachine, the combination of a fixed frame, a movableframe supported thereon and carrying the operative parts, a screw-rodconnecting the tvvo frames, a crank thereon, a movable nut on suchscrew-rod, and a ratchet and dog, said dog connected with the drill, sothat the movement of the latter causes the rotation of such nut to movethe operative part on such fixed frame.

8. In a drilling-machine, the combination of the fixed frame, a movableframe supported thereon and carrying the operative parts, a screw-rodconnecting the two frames, a movable nut on said screw-rod, and aratchet and dog, said dog connected with the drill, so that the movementof the latter causes the rotation of such nut to move the operativeparts on the iixed frame.

9. In a drillingmachine, the combination of a fixed frame, a movableframe supported thereon and carrying` the operative parts, a screw-rodconnecting the two frames, a crank thereon, a locking device for saidcrank, a movable nut on such screw-rod, and aratchet and dog, said dogconnected With the drill,`so that the movement of the latter causes therotation of such nut to move the operative parts on the fixed frame.

lO. In a drilling-machine, the combination of a fixed frame, a movableframe supported thereon and carrying the operative parts, a screw-rodconnecting the two frames and a crank thereon, a locking device for saidcrank, a movable nut on said screw-rod, a locking device for said nut,and a ratchet and dog, said dog, connected with the drill, so that themovement of the latter causes the rotation of such nut to move theoperative parts on the fixed frame.

li. In a drilling-machine, thc combination of a fixed frame with amoving` frame sup- IOO ported thereon and carrying the operative parts,a screw-rod connecting the same, a nut and ratchet-wheel thereon, a dogto operate such ratchet-wheel, and a latch to hold such dog out ofoperative position.

Signed this 30th day of March, i889.

ELMER A. SPERRY. In presence of FRANoIs W. PARKER, CELESTE P. CHAPMAN.

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